After Reading Why I left the CCM, I now see why the author was so frequently mentioning the danger of syncopated musics.
Syncopation is a style in music that could be beautiful sometimes, giving surprises, etc.; However, when used heavily, as in today's Christian music, it is a sign of rebellion. Not wanting to follow order, creating a sense of "rebellious beauty" for going off beat, concealed under soothing words. The seed of rebellion is planted nontheless.